package thread;

/**
 * 互斥锁
 * 当使用多个synchronized锁定多个代码片段，并且指定的锁对象都相同时，这些代码片段就是互斥的 即：多个线程不能同时执行他们
 */
public class SyncDemo4 {
    public static void main(String[] args) {
        Foo foo1 = new Foo();
        Foo foo2 = new Foo();
        Thread t1 = new Thread(){
            @Override
            public void run() {
                foo1.methodB();
            }
        };

        Thread t2 = new Thread(){
            @Override
            public void run() {
                foo2.methodB();
            }
        };
        t1.start();
        t2.start();

    }
}

class Foo{
    public synchronized void methodA(){

        try {
            Thread t = Thread.currentThread();
            System.out.println(t.getName() + "正在执行A方法");
            Thread.sleep(5000);
            System.out.println(t.getName() + "执行A结束");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

    public void methodB(){
        synchronized(Foo.class) {
            try {
                Thread t = Thread.currentThread();
                System.out.println(t.getName() + "正在执行B方法");
                Thread.sleep(5000);
                System.out.println(t.getName() + "执行B结束");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }
}
